But now US-based Uber, Google-backed Go-Jek and Singapore's Grab are locked in a race for ride-hailing app supremacy in South-east Asia's biggest economy, denting the fortunes of traditional three-wheeled bajaj taxis that once ruled Indonesia's roads.

"Our income has fallen between 70 and 80 per cent since ride-hailing apps came on the scene," said Mr Zainuddin, who like many Indonesians goes by one name.

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By contrast, Go-Jek alone claims 900,000 drivers and some 15 million weekly active users. It launched in 2010.

Google and Temasek have announced investments in Go-Jek, which has been valued at as much as US$5 billion although it's little known outside Asia.

Southeast Asia's ride-hailing market more than doubled in two years to some US$5 billion in 2017 and it's expected to reach US$20 billion by 2025, with Indonesia set to account for some 40 per cent of it, according to research done by Google and Temasek.

Go-Jek, which also reportedly won funding from Chinese internet giant Tencent, has said it is mulling an initial public offering as it looks to grow in Indonesia and beyond.

That could inflate its army of motorcycle taxis, private cars and other services - from massage and house cleaning to grocery shopping and package deliveries - all available at users' fingertips.

The ride-hailing trio offer fixed-price rides that take haggling out of the equation, a welcome change for former bajaj customer Tetty Iskandar.

"I haven't taken a bajaj in years," said the 35-year-old housewife, who used to ride the three-wheelers to go grocery shopping.

"You had to bargain with the drivers to get cheap fares. And you would already have done bargaining a lot in the market. Sometimes I felt so tired and just wanted to get home." The vast archipelago of some 260 million people has a relatively low per-capita car ownership rate.

And vehicle owners often choose to leave their ride at home, opting instead for a fixed-price motorcycle that can zip through Jakarta's epic traffic congestion - at a bargain-basement prices.

That is threatening bajaj - not to mention regular cabs and ubiquitous motorbike taxis known as ojek - which arrived in Indonesia during the 1970s.

The motorised rickshaw quickly made inroads under its namesake company, which hailed from India.

The name bajaj is now inked into Jakarta's lexicon after supplanting traditional bicycle taxis.

A distinctive blue model of the vehicle is still a common sight and while pollution-spewing older models are outlawed, some still ply the narrow alleyways of Indonesia's sprawling capital. AFP